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// This file implements privilege separation

package main

import (
	"errors"
	"os/user"
	"strconv"
	"net"
	"os"
	"path"

	"github.com/sarnowski/mitigation"
)


func dropPrivAndListen(userName, sockPath string) (net.Listener, error) {
	if !mitigation.CanActivate() {
		return nil, errors.New("cannot drop privileges")
	}
	usr, _ := user.Lookup(userName)
	uid, _ := strconv.Atoi(usr.Uid)
	gid, _ := strconv.Atoi(usr.Gid)

	socket := path.Join(usr.HomeDir, sockPath)
	os.Remove(socket)

	l, err := net.Listen("unix", socket)
	if err != nil {
		return nil, err
	}
	os.Chown(socket, uid, gid)
	os.Chmod(socket, 0660)

	mitigation.Activate(uid, gid, usr.HomeDir)
	return l, nil
}